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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on November 3, 2006
ICES Journal of Marine Science: Journal du Conseil 2007 64(1):192-209; doi:10.1093/icesjms/fsl014
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© 2006 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Impact of technological creep on fishing effort and fishing mortality, for a selection of European fleets

Paul Marchal1, Bo Andersen2, B. Caillart3, Ole Eigaard2, Olivier Guyader4, Holger Hovgaard2, Ane Iriondo5, Fanny Le Fur3, Jacques Sacchi6 and Marina Santurtún5

1 IFREMER, Channel and North Sea Fisheries Department, 150 Quai Gambetta, BP 699, 62321 Boulogne sur mer, France
2 DIFRES, Charlottenlund Castle, DK2920 Charlottenlund, Denmark
3 Oceanic Developpement, ZI du Moros, 29900 Concarneau, France
4 IFREMER, Fisheries Economy Department, BP 70, 29280 Plouzané, France
5 AZTI, Fisheries Resources Department, Txatxarramendi Ugarte, Z/G, 48395 Sukarrieta, Spain
6 IFREMER, Mediterranean and Overseas Fisheries Department, Avenue Jean Monnet, BP 171, 34203 Sète Cedex, France

Correspondence to P. Marchal: tel: +33 321 995600; fax: +33 321 995601; e-mail: paul.marchal{at}ifremer.fr

Marchal, P., Andersen, B., Caillart, B., Eigaard, Guyader, O., Hovgaard, H., Iriondo, A., Le Fur, F., Sacchi, J., and Santurtún, M. 2007. Impact of technological creep on fishing effort and fishing mortality, for a selection of European fleets–ICES Journal of Marine Science, 64, 192–209.

Face-to-face interviews were conducted to identify the main changes in gear and vessel technology that may have improved the fishing efficiency of a number of French, Danish, and Basque fleets over the past few decades. Important changes include the gradual appearance of twin trawls (Danish and French trawlers) and trammel-nets (French gillnetters), and the increased polyvalence of Basque bottom trawlers. The results suggest that fishing effort descriptors that are not traditionally measured (gear type, groundrope type, length of net used per day, headline length, crew size, number of winch or net drums) may have a substantial impact on catch rates. Adjusting fishing effort using such descriptors may generally improve the relationship between fishing effort and fishing mortality.

Keywords: catch rate, fishing effort, fishing mortality, generalized linear models, groundrope, technological creep, twin trawls

Received 4 January 2006; accepted 6 August 2006; advance access publication 3 November 2006.


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